105
You could try dividing by composite numbers but the number that you are testing is divisible by a composite number, then it will be divisible by a prime factor of that composite number and that prime factor will be smaller. It is always easier to work with smaller numbers.
No. That isn't possible: A prime number, by definition, has no smaller factors. A square number does have a smaller factor - the number that is squared.
No. Odd numbers can be greater than, smaller than, or equal to prime numbers.
Usually, but not necessarily and not if they're prime. All prime numbers have the same number of factors.
None. There is only one number in 500. That number is "500" and it is not a prime number.There are 94 prime numbers that are smaller than 500.
Usually, but not necessarily and not if they're prime. All prime numbers have the same number of factors.
the least number is 210 which is divisible by four different prime numbers.
You go through each number, starting with 2, 3, 4, ... and check if the number has any smaller factors. If it has no smaller factors, you conclude it is a prime number. Continue until you have 10 prime numbers.
Because no numbers smaller than two are prime.
Since there are an infinite number of prime numbers, there are infinite numbers with any given number of prime factors.
Keep dividing the original number by smaller prime numbers until the results are all prime.
A composite number. (If they are different numbers, keep in mind 1 is not a prime number)